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Son of 'El Chapo' was kidnapped

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Abduction took place at the trendy La Leche restaurant in Puerto Vallarta

The elder Guzman is in prison, fighting extradition to US

(CNN)Shortly before 1 a.m. on Monday, seven armed men stormed into a trendy restaurant on the main drag of Mexican beach resort Puerto Vallarta.

They interrupted a group of revelers in the white-walled restaurant, separating the men from the women, and left with a high-value captive, according to Mexican authorities.

Jesus Alfredo Guzman, the 29-year-old son of jailed Mexican drug lord Joaquin "El Chapo" Guzman, was among the six men kidnapped, Jalisco Attorney General Eduardo Almaguer said at a news conference Tuesday.

The kidnapping is the latest blow to the elder Guzman's efforts from behind bars to maintain Sinaloa cartel's dominance in the region amid challenges from an emerging rival, the Jalisco New Generation cartel.

Jesus Alfredo and his brother Ivan Archivaldo Guzman are thought to be involved with the Sinaloa cartel, along with Guzman's son by another woman, Ovidio Guzmán Lopez.

Though Almaguer did not attribute the kidnappings to New Generation, he said that a criminal group was responsible.

Witness interviews, surveillance video and a search of five vehicles parked outside La Leche led to the identification of Jesus Alfredo and three other men, all with ties to organized crime, Almaguer said. The additional men men were identified as Juan Daniel Calva Tapia, 53, Josias Nahujali Rabago Borbolla, 35 and Víctor Galvan Ureña, 46.

"At this moment, we have identified four of the kidnapped," Almaguer said, "one of them being Jesus Alfredo Guzman."

Photos:'El Chapo' in prison

Photos:'El Chapo' in prison

Joaquin "El Chapo" Guzman stands in his cell at the Altiplano Federal Prison in Mexico. Increased security measures are being used by authorities to make sure the cartel kingpin doesn't break out of prison for a third time. His most recent escape came in July, when he got out through a hole in the floor of his cell's shower stall. The images in this gallery were obtained by Mexican journalist Carlos Loret de Mola.

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Photos:'El Chapo' in prison

Military vehicles and canine officers guard the Altiplano prison.

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Photos:'El Chapo' in prison

Guards walk down a hallway of the prison, which has installed 400 new cameras. Authorities hope to add another 600 by April.

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Photos:'El Chapo' in prison

An X-ray machine is guarded at the prison's entrance.

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Photos:'El Chapo' in prison

A body scan machine is also at the front entrance.

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Photos:'El Chapo' in prison

An officer operates the body scan machine.

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Photos:'El Chapo' in prison

An officer at the entrance swabs a visitor to detect explosives.

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The Mexican army, marines, federal police, state police and the country's top prosecution office are searching for the missing men as well as those responsible, Almaguer said.

No one has contacted Mexican authorities to report the men missing, and authorities have not heard from the kidnappers, Almaguer said.

Jesus Alfredo is the youngest of El Chapo's two children from his first marriage. His older brother, Ivan Archivaldo Guzman, was imprisoned in Mexico in 2005, but released three years later for lack of evidence.

Earlier Tuesday, Guzman family attorney Pablo Badillo said it was "very likely" that Ivan Archivaldo was abducted from the restaurant. Badillo told CNN the Guzman family contacted him Tuesday afternoon and told him that "the possibility of Ivan Archivaldo having been abducted is very high."